<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .box1 {
        width: 200px;
        height: 200px;
        border-radius: 50%;
        background-image: radial-gradient(at 80px 80px, white, #333);
        margin: 0 auto;
      }

      .box2 {
        width: 600px;
        height: 800px;
        line-height: 30px;
        padding: 5px;
        border: 1px solid black;
        margin: 0 auto;
        background-image: repeating-linear-gradient(
          transparent 0px,
          transparent 29px,
          gray 30px
        );
        background-clip: content-box;
        text-align: left;
      }
    </style>
  </head>
  <body>
    <div class="box1">立体效果</div>

    <div class="box2" contenteditable="true">
      <span>作业本-可编辑contenteditable</span>
    </div>
  </body>
</html>
